U.S. patent application number 10/170107 was filed with the patent office on 2002-12-26 for supplemental handle.
Invention is credited to Frauhammer, Karl, Meixner, Gerhard, Strasser, Andreas.
Application Number | 20020197939 10/170107 |
Document ID | / |
Family ID | 7689346 |
Filed Date | 2002-12-26 |
United States Patent
Application |
20020197939 |
Kind Code |
A1 |
Frauhammer, Karl ; et
al. |
December 26, 2002 |
Supplemental handle
Abstract
A supplemental handle for a hand-held machining tool (18), has
at least one grip element (10, 12, 14, 16) that is connectable with
a housing (26) of the hand-held machine (18) by means of an
insulating device (20, 22, 24) for insulating oscillations. The
insulating device (20, 22, 24) includes at least one bearing unit
(28, 30, 32, 34), and the grip element (10, 12, 14, 16) is guided
in at least one direction by means of the bearing unit (28, 30, 32,
34). The bearing unit (28) has at least one bearing bolt (26),
about which the grip element (10, 12) is pivotable. The insulating
device may include at least one torsion spring.
Inventors: |
Frauhammer, Karl;
(Leinfelden-Echterdingen, DE) ; Meixner, Gerhard;
(Filderstadt, DE) ; Strasser, Andreas;
(Rudersberg, DE) |
Correspondence
Address: |
STRIKER, STRIKER & STENBY
103 East Neck Road
Huntington
NY
11743
US
|
Family ID: |
7689346 |
Appl. No.: |
10/170107 |
Filed: |
June 12, 2002 |
Current U.S.
Class: |
451/64 |
Current CPC
Class: |
Y10T 408/96 20150115;
B25F 5/026 20130101; B25F 5/006 20130101; B25D 17/043 20130101;
Y10T 16/4713 20150115; Y10T 16/476 20150115; Y10S 16/90
20130101 |
Class at
Publication: |
451/64 |
International
Class: |
B24B 007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jun 25, 2001 |
DE |
101 30 548.6 |
Claims
What is claimed as new and desired to be protected by Letters
Patent is set forth in the appended claims:
1. Supplemental handle for a hand-held machining tool (18),
comprising at least one grip element (10, 12, 14, 16), wherein said
at least one grip element (10, 12, 14, 16) is connectable with a
housing (26) of the hand-held machine (18) by means of an
insulating device (20, 22, 24) for insulating oscillations, wherein
the insulating device (20, 22, 24) has at least one bearing unit
(28, 30, 32, 34), wherein the at least one grip element (10, 12,
14, 16) is guided in at least one direction by means of said at
least one bearing unit (28, 30, 32, 34).
2. Supplemental handle as defined in claim 1, wherein the bearing
unit (28) has at least one bearing bolt (26), and wherein the at
least one grip element (10, 12) is pivotable about said bearing
bolt (36).
3. Supplemental handle as defined in claim 2, wherein the
insulating device (20) for insulating oscillations of the at least
one grip element (10, 12) has at least one torsion spring.
4. Supplemental handle as defined in claim 1, wherein the at least
one grip element (12) is rotatably supported about a longitudinal
axis of said at least one grip element (12).
5. Supplemental handle as defined in claim 1, wherein the at least
one grip element (14, 16) is guided translatory by means of the
bearing unit (30, 320, 34) in at least one direction.
6. Supplemental handle as defined in claim 5, wherein the bearing
unit (30, 32, 34) for guiding the at least one grip element (14,
16) has at least one carriage, wherein said at least one carriage
(40) is guided in a guide rail (38).
7. Supplemental handle as defined in claim 6, wherein movement of
the at least one carriage (40) in the guide rail (38) in a
machining direction (42) is limited by an end stop (44).
8. Supplemental handle as defined in claim 6, wherein the guide
rail (38) is sealed outwardly by means of at least one sealing
element.
9. Supplemental handle as defined in claim 5, wherein the at least
one grip element (14, 16) is guided in a machining direction (42)
by means of said at least one bearing unit (31, 32, 34).
10. Supplemental handle as defined in claim 5, wherein said at
least one bearing unit (32, 34) of the insulating device (24) is
disposed in front of and after the at least one grip element (16)
in a longitudinal direction of said at least one grip element
(16).
11. Supplemental handle as defined in claim 1, wherein the
insulating device (20, 22, 24) has at least one compression spring
(46, 48, 50).
12. Supplemental handle as defined in claim 1, wherein at at least
one selected characteristic magnitude of an operating parameter, in
addition to at least one first spring element (36, 58), at least
one second spring element (46, 50) of the insulating device comes
into a working connection.
13. A hand-held machining tool with the supplemental handle as
defined in claim 1.
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a supplemental handle for a
hand-held machining tool.
[0002] DE 28 04 223 C1 discloses a supplemental handle of this type
with a grip element that is connectable to a housing of a hand-held
machining tool, which has a particular tendency for axial
oscillation, by means of an insulation device. In a grip element
formed from a casing, a threaded bold is mounted, which is
screwable into a recess of the housing of the handheld machining
tool with its free end that projects from the grip element. A
rubber-elastic, insulating layer is provided between the threaded
bolt and the grip element.
SUMMARY OF THE INVENTION
[0003] The present invention is based on a supplemental handle for
a hand-held machining tool with at least one grip element, or
handle, which is connectable to a housing of the hand-held
machining tool by means of an insulating device for vibration or
oscillation insulation.
[0004] It is proposed that the insulation device has at least one
bearing unit, by which the grip element is guided in at least one
direction. With the insulating device of the present invention, an
advantageous insulation of vibration and oscillation of the grip
element in the oscillation direction is provided, thus leading to a
stabile, controlled guiding of the hand-held machining tool by
means of the grip element.
[0005] When the bearing unit has at least one bearing bolt, about
which the grip element is pivotable, a compact bearing unit of
simple construction can be obtained, in which, preferably, a
clamping slope of the grip element can be avoided. It is
contemplated that the most ergonomically effective form of the
handle has a pivoting angle of up to 25.degree..
[0006] In addition, the insulating device for insulating
oscillation of the grip element preferably has at least one torsion
spring. The torsion spring can be used as a bearing bolt tensioned
by the pivoting movement of the grip element. With minimal
components, a constructively simple and space-saving insulating
device for the insulating of oscillation and vibrations is
achievable. It is also contemplated that instead of torsion
springs, the practitioner would also recognized various other types
of spring elements or spring units as workable with the present
invention, for example, spring units with one or more compression
springs, air compression springs, rubber casings, and the like.
[0007] It is particularly advantageous if the grip element is
supported so as to be rotatable about its longitudinal axis. A
compensating movement in the wrist of the user can be avoided, and
thus, comfortable and wrist-protecting work is made possible.
[0008] In a further form of the present invention, the grip element
is translatory guided via the bearing unit in at least one
direction against a spring element. Preferably, a distance between
a machining axis, in particular a drill hammer and/or chipping
hammer, and the grip element, as well as the orientation of the
grip element to the machining axis, is kept constant. The hand-held
machining tool is exactly guidable, and a movement in the wrist of
the user during a machining process can be avoided, particularly
through a linear guide of the grip element, and the comfort for the
user can be increased.
[0009] The translatory guide, in particular the linear guide, of
the grip element on the hand-held machining tool can be achieved
with a simple construction, in which the bearing unit for guiding
the grip element has at least one sliding carriage or rail that is
guided into a guide rail. In order to avoid angle of the sliding
carriage in the guide rail, the sliding carriage is fitted with a
corresponding large guide surface.
[0010] If the guide rail is sealed from the outside by at least one
sealing element, an advantageous protection of the bearing unit,
and in particular of a spring element of the insulating device,
from contamination by fine machining dust during a drilling
operation, can be obtained. If the spring element breaks during a
machining process, an advantageous protection of the user by means
of the sealing element is obtained, and pieces that are loose or
falling off can be caught.
[0011] Preferably, the carriage is limited in the guide rail in the
machining direction through an end stop. By means of the end stop,
a safe guiding of the hand-held machining tool is permitted if a
break in the spring element occurs during the machining process. If
the end stop is made from an insulating and/or damping material, an
insulating and/or damping effect of the insulating device can be
maintained upon contact of the grip element at the end stop, for
example, in particular machining positions, in which a spring force
of the spring element surpasses a pressing force, or upon breaking
of the spring element, and so on. Thus, the hand-held machining
tool is still comfortably guidable.
[0012] When the grip element is guided by means of the bearing unit
in the machining direction, an advantageous insulating of
oscillations and guiding can be obtained with hand-held machining
tools in which oscillation in a first line in the machining
direction occur, for example, with hand saws, scrapers, and in
particularly, with drilling and/or chipping hammers.
[0013] Preferably, a bearing unit of the insulating device is
arranged in front of and behind the grip element in its
longitudinal direction. Rotational moment on the bearing units and
clamping angles associated with such moment can be avoided. It is
also contemplated that the practitioner skilled in the art would
recognize various constructions in order to avoid rotational moment
in the bearing unit of the insulating device, for example, with a
bearing unit lying in the load axis of the grip element, and so
forth.
[0014] In addition, the insulating device preferably has a
compression spring. Compression spring can be manufactured cost
effectively with minimal tolerances. If a main handle of the
hand-held machining toll has an insulating device with compression
springs, simple compressions springs with the same insulating
and/or damping characteristics as the main handle can be used.
[0015] When the insulating device has counteracting spring
elements, for example, counteracting, tensioned torsion springs,
compression springs, air compression springs, rubber casings, and
so forth, an advantageous oscillation insulating can be achieved in
two opposite directions. Upon a small pressing force supplied by
the user via the grip element, a comfortable oscillation insulating
of the grip element in two directions is obtainable. In addition,
the spring elements can be constructed in each direction with
different characteristics, in particular, with different insulating
qualities, and be adapted to different limitations. In this regard,
a build-up of oscillations upon reaching a resonance frequency of
one of the two spring elements is avoidable.
[0016] If, in addition to at least one first spring element, a
second spring element of the insulating device comes into an
operative connection when at least one selected characteristic
magnitude of an operating parameter, a resulting spring
characteristic curve can be designed in a particularly flexible
manner and with inexpensive standard spring elements for various
types of uses. This can be achieved simply, in which at a selected,
applied pressure in the direction of movement of the grip element,
or at a determined spring travel course of the first spring
element, the second spring element comes into contact in addition
to the first spring element. It is also possible, however, that
depending on a position of the hand-held machining tool, more or
fewer spring elements come into a working connection. This can be
realized, for example with a key action using gravitational force,
in which the hand-held machining tool, in a level position, either
clicks a spring element and/or a contact surface in a first
corresponding position, so that the spring element is lined to the
grip element by means of a force, and in which the hand-held
machining tool, in a perpendicular position, clicks the spring
element and/or the contact surface downwardly in a second
corresponding position, so that a linking of the spring element
through a force on the grip element is avoided. In addition to the
described mechanics, additional mechanisms that a practitioner
would recognize as logical and useful in the present invention are
contemplated.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017] FIG. 1 shows a drilling and chipping hammer with a pivotably
supported supplemental handle, according to the present
invention;
[0018] FIG. 1 shows an enlarged view of the cutaway II of FIG. 1
with an insulating device of the supplemental handle;
[0019] FIG. 3 shows a section along lines III-III in FIG. 2;
[0020] FIG. 4 shows a variant to the embodiment of FIG. 1 with a
U-shaped or loop handle;
[0021] FIG. 5 shows the U-shaped handle of FIG. 4 in a side
view;
[0022] FIG. 6 shows a drilling and chipping hammer with a partial
sectional view taken through an insulating device of a translatory
guided supplemental handle;
[0023] FIG. 7 shows a partial view taken through another embodiment
of an insulating device with a multi-stage spring unit;
[0024] FIG. 8 shows a variant to the embodiment of FIG. 5 with a
loop or U-shaped handle; and
[0025] FIG. 9 shows the loop handle of FIG. 8 in a side view with a
partial sectional view taken through its insulating device.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0026] FIG. 1 shows a drilling and chipping hammer 18 with an
electric motor (not clearly shown) arranged in a housing 26. A tool
(not specifically shown), insertable into a tool holder 52, is
rotatably driven by a drive, and via a striking mechanism is
impacted, by operation of the electric motor. On one side of the
housing 25 facing away from the tool holder 52, a main handle 54 is
disposed, which is connected with the housing 25 via an insulating
device 56.
[0027] In a front area of the housing 26, after the tool holder 52
relative to the machining direction 42, a shoulder 58 is formed, on
which a supplemental handle with a grip element 10 is secured by
means of a clamping ring or collar 60.
[0028] The supplemental handle, formed as a post or shaft handle,
is connected with the housing 26 of the drill and chipping hammer
18 by an insulating device 20 (FIGS. 1 and 2).
[0029] The insulating device 20 has a bearing unit 28 with a
torsion spring, formed as a bearing bolt 36, around which the grip
element 10 is pivotably supported and is guided in the machining
direction 42. The bearing unit 28 is disposed between the grip
element 10 and the housing 26. The bearing bolt 36 is mounted such
that its first end 66 is non-rotatably supported in a first leg 68
of a U-shaped receiving area 62 of a stepped extension of the
collar 60 that extends radial to the housing 26. The second end 70
of the bearing bolt 36 is rotatably supported in a second leg 72 of
the receiving area 62 (FIG. 3). The bearing bolt 36 is guided by
means of a bearing bore 74 of the grip element 10, and on the side
of the bearing bolt facing toward the second end 70, the bearing
bolt is non-rotatably connected with the bearing bolt 36 via a
stage.
[0030] Upon chipping and/or drilling, the user guides the drill or
chipping hammer 18 at the main handle 54 and at the
oscillation-insulated grip element 10 of the supplemental handle in
the machining direction 42 against a surface to be machined,
whereby the supplemental handle for oscillation insulating can be
linked pivotably against a spring force of the torsion spring,
formed as a bearing bolt 36.
[0031] The insulating device 20 further comprises a compression
spring 46, which is secured with its end that faces away from the
machining direction 42 into the receiving area 62 of the collar 60.
At a selected magnitude, or a selected applied force of the user on
the supplemental handle in the machining direction 4, the
compression spring 46, with its end in the machining direction 42,
comes into contact with a catch 76 formed on the grip element 10.
The spring forces of the torsion spring and the compression spring
46 are added together, and achieve an increased spring rigidity
(FIG. 2).
[0032] In FIGS. 4 through 9, further embodiments of the invention
are illustrated. Like components are represented with the same
reference numerals as used to describe the previous embodiments. In
addition, similar features and functions are to be referenced in
the description of the embodiments shown in FIGS. 1 through 3. The
following description is limited essentially to differences between
the embodiments shown in FIGS. 4 through 9 and the embodiments of
FIGS. 1 through 3.
[0033] In FIGS. 4 and 5, a supplemental handle formed as a loop or
U-shaped handle is shown, in which the U-shaped handle is connected
with a housing 25 of a drilling and chipping hammer 18 via the
insulating device 20 of the embodiment of FIGS. 1 through 3. The
loop handle is rotatably supported about its longitudinal axis in
front of and behind its grip element 12 in its longitudinal
direction, respectively, in a bearing unit 84, 86.
[0034] In FIG. 6, a supplemental handle formed as a pole or staff
handle of a drilling or chipping hammer 18 with an insulating
device 22 is illustrated. The supplemental handle is connected with
a housing 26 of the drilling and chipping chamber 18 by means of
the insulating device 22 and via a stepped projection 78 of a
collar 80, whereby the projection 78 extends radially to the
housing 26.
[0035] The insulating device 22 has a bearing unit 30, by means of
which a grip element 14 of the supplemental handle is translatory
guided in the machining direction 42.
[0036] The bearing element 30 sealed with a sealing element (not
specifically shown) has a guide rail 38 and a carriage 40 guided in
the guide rail 38, with the grip element 14 secured to the carriage
40.
[0037] The grip element 14 is guidable via the carriage 40 in the
bearing unit 30 in the machining direction 42 against a compression
spring 48 (FIG. 6). The compression spring 48 is braced with its
front end (that is, the end nearest the machining direction 42) on
a wall of the guide rail 38 and operates with its back end (that
is, the end opposite the machining direction) on the carriage 40.
The wall of the guide rail 38 toward the machining direction 42
serves as an end stop 44 for the carriage 40 guided in the guide
rail 38. Opposite to the machining direction 42, the guide rail 38
has a stop 82, made of an elastic rubber, which is secured to a
wall of the guide rail 38 and operates to insulating oscillations.
The compression spring 48, tension in a resting state, presses the
carriage 40 with a side that faces away from the machining
direction counter to the machining direction 42 against the stop 82
(FIG. 6).
[0038] When the user guides the drilling and chipping hammer 18 at
a main handle 54 and at the grip element 14 of the supplemental
handle against a surface to be machined, the grip element 14 is
guided by means of a pressing force of the user via the carriage 40
in the machining direction 42 against a spring force of the
compression spring 48. With the translatory movement of the grip
element 14 with a constant distinct to a machining axis of the
drilling and chipping hammer 18, the grip element 14 is uncoupled
in an axial direction from the housing 26, and the insulating
device 22 operates to insulate oscillations between the housing 26
and the grip element 14 (FIG. 6).
[0039] FIG. 7 shows an alternative supplemental handle to that of
FIG. 6 with an insulating device 20', in which near a first
compressions spring 48, a second compression spring 50 is disposed
in a guide rail 38. The second compression spring 50 is secured to
a wall of the guide rail 38 with its end that is toward the
machining direction. The other end of the compression spring 50,
that is the end away from the machining direction 42, comes into
contact with the carriage 50 guided in the guide rail 38 at a
selected characteristic magnitude, or at a selected applied force
of the use on the supplemental handle in the machining direction
42.
[0040] If the drilling and chipping hammer 18 is operated in level
or horizontal working position, the weight force of the drilling
and chipping hammer 18 acts perpendicular to the machining
direction 42, and a greater operating force in the machining
direction 42 be must applied by the user onto the grip element 14
then with a downward perpendicular working position. By means of
the larger applied operating force, the first compression spring 48
is compressed to the point that the carriage 40 comes into contact
with the second compression spring 50. The spring force of the
first and the second compression springs 48, 50 total to a spring
force that is advantageous for a horizontal or level working
position. The spring operation, or the insulating operation, is
maintained also with a strong counter pressure. In downwardly
perpendicular working positions, in horizontal working positions,
and in upwardly perpendicular working positions an advantageous
insulating area is consistently provided for the corresponding
working position.
[0041] It will be understood that each of the elements described
above, or two or more together, may also find a useful application
in other types of constructions differing from the types described
above.
[0042] While the invention has been illustrated and described
herein as a supplemental handle for a hand-held machining tool, it
is not intended to be limited to the details shown, since various
modifications and structural changes may be made without departing
in any way from the spirit of the present invention.
[0043] Without further analysis, the foregoing will so fully reveal
the gist of the present invention that others can, by applying
current knowledge, readily adapt it for various applications
without omitting features that, from the standpoint of prior art,
fairly constitute essential characteristics of the generic or
specific aspects of this invention.
* * * * *